LMCCN Texas Instruments Timers & Support Products A LMCCN/ NOPB datasheet, inventory, & pricing. LMCCN. LMCCN Note: See Mil-datasheet MNLMCX for specifications on the military device LMCJ/ LMCMOS™ is a. Note: See Mil-datasheet MNLMCX for specifications on the military device LMCJ/ LMCMOS™ is a trademark of National Semiconductor Corp.

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LMCCN Datasheet(PDF) – National Semiconductor (TI)

Posted by nodestination1 in forum: So in a nutshell, my plan is to make this timer press the space bar at predetermined intervals Hopefully I haven’t made things more confusing than datashheet were before!! You gave a datashheet of info, but I have to admit I’m still confused, so break it down.

I’ve attached a schematic of the actual circuit below but without a few modifications that I’ll mention later. Thanks again for taking your time to reply!

Help/advice with 555 timer circuit

Jun 23, 5. It isn’t to improve your user experience. HELP with timer Posted by itel in forum: Malware on Android Devices Mimics Hardware Specs and Wastes Billions of Dollars Ever wonder why so many Android apps ask users if they’d like to download obscure add ons like “smart charging”?

No, create an account now. I’m trying to get the output to go low for 3 to 10 seconds which I’m hoping can be tweaked by the potentiometer and then I’m aiming for a mS duration for when the output goes high I pulled this figure out of thin air as I’ve really no idea how long to make the simulated key press – it just seemed to fit!

CMOS Timer

Once the circuit is powered it will then be left alone maybe for a couple of hours without any further intervention. There’s times when I just can’t quite explain things simply and something tells me this could be one of those times so apologies if that’s the case!! So far, after datsheet 2 days trawling through both Google here for inspiration I’ve come up with the circuit below but with a few modifications. The idea behind this circuit is to automatically cue slides for presentations.


Its output high voltage is spec’d with an output current of only 2mA which might not l,c555cn enough to turn on your solid state relay.

Help/advice with timer circuit | All About Circuits

After sifting through the datasheet of the a few times I can’t find any mention of the maximum output current so from here onwards it’s 2mA! Also, if there is an easier way to accomplish the same task please let me know I’m all ears!!!

Usually you would just set the slides to automatically advance and set them to loop. Essentially, I’m taking a keyboard PCB and attaching the corresponding contacts for the space bar to a solid state relay. datasheeg

Mar 24, 21, 2, Jun 23, 2. I’m hoping I’ve included enough info here but if I’ve omitted anything let me know!!! How long to you want this timer to work in secondsand what are you using to trigger it a push button? Your name or email address: Hi all, First up, my apologies for another thread as I can’t find a similar thread to tag onto Lmc5555cn with making a timer circuit Posted by paulareno in forum: After re-reading my post it looks like I completely forgot to mention how I’m going to use the timer!!

Jun 23, 1. Also, which type of capacitors should I be using for my project – tantalums, ceramic or electrolytic as I am a complete novice!


As the power is being tapped off the USB port in parallel to the keyboard am I guessing correctly that it would be a good idea to include this bypass and, if so, what capacitor should I use? I’m attempting to make up a circuit that will trigger a key press on a keyboard with the help of a solid state relay. Jul 22, 10 0. Yes, my password is: Or will there be something I need to add such as a resistor to ensure the SSR does turn off?

I’m planning on having 2 relays in series – one will lmcc555cn and simulate the space bar being pressed, one relay will light up an LED and the other will simply just close an lmc555n circuit for external expansion one of these relays are a dual SPST relay hence 2 relays! You May Also Like: Do you already have an account? I have to admit Dataxheet did have a moment of horror when you mentioned the 2mA output current – I just checked the datasheet of datashet SSR and found that the stated maximum forward current is 2mA I had originally thought it was 3mA hence my brief moment of panic!!!

The supply current spike from a Cmos operating at your low supply voltage is tiny compared to the up to mA supply current spike caused by an ordinary I’ve lost track of what I’ve read where but I did read something about having a capacitor as a supply bypass due to spikes from the when it changes state.

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